svn version 254 demonstrates a some issues when compiling for iPhone
simulator 3.0 and 3.1.2: 

the compilation output is listed below. 

What steps will reproduce the problem?
1. xcode 3.1.2
2. compile for 10.1.6


suggested patch:

Index: Foundation/GTMNSObject+KeyValueObserving.m
===================================================================
--- Foundation/GTMNSObject+KeyValueObserving.m	(revision 254)
+++ Foundation/GTMNSObject+KeyValueObserving.m	(working copy)
@@ -156,6 +156,9 @@
 
 @end
 
+extern int objc_atomicCompareAndSwapGlobalBarrier(void*, void*, void*); 
+
+
 @implementation GTMKeyValueObservingCenter
 
 + (id)defaultCenter {
Index: Foundation/GTMLoggerTest.m
===================================================================
--- Foundation/GTMLoggerTest.m	(revision 254)
+++ Foundation/GTMLoggerTest.m	(working copy)
@@ -295,7 +295,7 @@
   [fh logMessage:@"test 4" level:kGTMLoggerLevelAssert];
   [fh closeFile];
   
-  NSString *contents = [NSString stringWithContentsOfFile:path_];
+  NSString *contents = [NSString stringWithContentsOfFile:path_
encoding:NSUTF8StringEncoding error:nil];
   
   STAssertEqualObjects(@"test 0\ntest 1\ntest 2\ntest 3\ntest 4\n",
contents, nil);
 }
@@ -458,7 +458,7 @@
   [fh logMessage:@"test 6" level:kGTMLoggerLevelInfo];
   [fh closeFile];
   
-  NSString *contents = [NSString stringWithContentsOfFile:path_];
+  NSString *contents = [NSString stringWithContentsOfFile:path_
encoding:NSUTF8StringEncoding error:nil];
   STAssertNotNil(contents, nil);
   STAssertEqualObjects(@"test 1\ntest 2\ntest 3\ntest 4\ntest 5\ntest
6\n", contents, nil);  
 }
Index: Foundation/GTMNSFileManager+PathTest.m
===================================================================
--- Foundation/GTMNSFileManager+PathTest.m	(revision 254)
+++ Foundation/GTMNSFileManager+PathTest.m	(working copy)
@@ -141,7 +141,7 @@
     }
     for (size_t j = 0; j < sizeof(testFiles) / sizeof(NSString*); j++) {
       NSString *testFile = [testDir
stringByAppendingPathComponent:testFiles[j]];
-      STAssertTrue([@"test" writeToFile:testFile atomically:YES], nil);
+      STAssertTrue([@"test" writeToFile:testFile atomically:YES
encoding:NSUTF8StringEncoding error:nil], nil);
     }
   }
   



CompileC
build/GTMiPhone.build/Debug-iphonesimulator/GTMiPhoneUnitTesting.build/Objects-normal/i386/GTMNSFileManager+PathTest.o
Foundation/GTMNSFileManager+PathTest.m normal i386 objective-c
com.apple.compilers.gcc.4_2
cd /Users/mwinter/tmp/google-toolbox-for-mac
setenv LANG en_US.US-ASCII
setenv PATH
"/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/opt/local/bin:/opt/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/Developer/usr/bin:/usr/X11/bin"
/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 -x
objective-c -arch i386 -fmessage-length=0 -pipe -std=c99 -Wno-trigraphs
-fpascal-strings -fasm-blocks -O0 -mdynamic-no-pic -Werror -Wreturn-type
-Wmissing-braces -Wparentheses -Wswitch -Wunused-function -Wunused-label
-Wunused-variable -Wunused-value -Wunknown-pragmas -Wshadow -Wnewline-eof
-D_GLIBCXX_DEBUG_PEDANTIC -D_GLIBCXX_DEBUG -D_GLIBCPP_CONCEPT_CHECKS
-DDEBUG=1 -D__IPHONE_OS_VERSION_MIN_REQUIRED=30000 -isysroot
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.0.sdk
-fvisibility=hidden -mmacosx-version-min=10.5 -gdwarf-2 -iquote
/Users/mwinter/tmp/google-toolbox-for-mac/build/GTMiPhone.build/Debug-iphonesimulator/GTMiPhoneUnitTesting.build/GTMiPhoneTest-generated-files.hmap
-I/Users/mwinter/tmp/google-toolbox-for-mac/build/GTMiPhone.build/Debug-iphonesimulator/GTMiPhoneUnitTesting.build/GTMiPhoneTest-own-target-headers.hmap
-I/Users/mwinter/tmp/google-toolbox-for-mac/build/GTMiPhone.build/Debug-iphonesimulator/GTMiPhoneUnitTesting.build/GTMiPhoneTest-all-target-headers.hmap
-iquote
/Users/mwinter/tmp/google-toolbox-for-mac/build/GTMiPhone.build/Debug-iphonesimulator/GTMiPhoneUnitTesting.build/GTMiPhoneTest-project-headers.hmap
-Wall -Wendif-labels -Winvalid-pch -Wformat=2 -Wmissing-format-attribute
-Wwrite-strings -Wstack-protector -Wstrict-aliasing=2 -Wpacked
-Wmissing-field-initializers -Wextra -Wno-unused-parameter -Wpointer-arith
-Wdisabled-optimization -Wfloat-equal
-F/Users/mwinter/tmp/google-toolbox-for-mac/build/Debug-iphonesimulator
-I/Users/mwinter/tmp/google-toolbox-for-mac/build/Debug-iphonesimulator/include
-I/Users/mwinter/tmp/google-toolbox-for-mac/build/GTMiPhone.build/Debug-iphonesimulator/GTMiPhoneUnitTesting.build/DerivedSources/i386
-I/Users/mwinter/tmp/google-toolbox-for-mac/build/GTMiPhone.build/Debug-iphonesimulator/GTMiPhoneUnitTesting.build/DerivedSources
-Wdiv-by-zero -Wbad-function-cast -Wnested-externs -Wold-style-definition
-fstack-protector -fstack-protector-all -include
/var/folders/h+/h+AKwl6EGhuQQkkrG6PCMk+++TI/-Caches-/com.apple.Xcode.501/SharedPrecompiledHeaders/GTM_Prefix-aujutpcpiljyurcgaitldeskopbz/GTM_Prefix.pch
-c
/Users/mwinter/tmp/google-toolbox-for-mac/Foundation/GTMNSFileManager+PathTest.m
-o
/Users/mwinter/tmp/google-toolbox-for-mac/build/GTMiPhone.build/Debug-iphonesimulator/GTMiPhoneUnitTesting.build/Objects-normal/i386/GTMNSFileManager+PathTest.o

cc1obj: warnings being treated as errors
/Users/mwinter/tmp/google-toolbox-for-mac/Foundation/GTMNSFileManager+PathTest.m:
In function '-[GTMNSFileManager_PathTest
testfilePathsWithExtensionsInDirectory]':
/Users/mwinter/tmp/google-toolbox-for-mac/Foundation/GTMNSFileManager+PathTest.m:144:
warning: 'writeToFile:atomically:' is deprecated (declared at
/Developer/Platforms/iPhoneSimulator.platform

cc1obj: warnings being treated as errors
/Users/mwinter/tmp/google-toolbox-for-mac/Foundation/GTMLoggerTest.m: In
function '-[GTMLoggerTest testFileHandleWriter]':
/Users/mwinter/tmp/google-toolbox-for-mac/Foundation/GTMLoggerTest.m:298:
warning: 'stringWithContentsOfFile:' is deprecated (declared at
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.0.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSString.h:357)
/Users/mwinter/tmp/google-toolbox-for-mac/Foundation/GTMLoggerTest.m: In
function '-[GTMLoggerTest testFileHandleCreation]':
/Users/mwinter/tmp/google-toolbox-for-mac/Foundation/GTMLoggerTest.m:461:
warning: 'stringWithContentsOfFile:' is deprecated
cc1obj: warnings being treated as errors
/Users/mwinter/tmp/google-toolbox-for-mac/Foundation/GTMNSObject+KeyValueObserving.m:
In function '+[GTMKeyValueObservingCenter defaultCenter]':
/Users/mwinter/tmp/google-toolbox-for-mac/Foundation/GTMNSObject+KeyValueObserving.m:169:
warning: implicit declaration of function
'objc_atomicCompareAndSwapGlobalBarrier'
/Users/mwinter/tmp/google-toolbox-for-mac/Foundation/GTMNSObject+KeyValueObserving.m:169:
warning: nested extern declaration of 'objc_atomicCompareAndSwapGlobalBarrier'